Method and device for the determination of minor cell...

G - Physics – 01 – N

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G01N 33/558 (2006.01)

Patent

CA 2674117

The invention relates to a method for determining one or more cellularly bound analytes in a liquid sample, said method being carried out using a device comprising: at least one feeding zone (5) for applying the liquid sample; a porous membrane (2) that is suitable for letting cellular components penetrate therethrough and includes at least one indicator zone on the membrane, said indicator zone being able to interact with the cellularly bound analyte and containing at least one binding element against the cellularly bound analyte; and at least one absorption area (3) on the membrane, which absorbs the liquid after the liquid has passed the indicator zones. The at least one indicator zone lies between the feeding zone (5) and the absorption area (3). The method is carried out for concentrating and quantifying the minor cell population in heterogeneous cell populations, for example in cases of fetomaternal hemorrhage or in chimera, detecting an analyte provided at a low concentration on cells, determining the hematocrit value, and/or determining, in parallel, cellularly bound analytes in mixed-field reactions.

L'invention concerne un procédé servant à déterminer un ou plusieurs analytes liés aux cellules dans un échantillon liquide. Ce procédé est exécuté au moyen d'un dispositif comprenant : au moins une zone d'alimentation (5) pour l'application de l'échantillon liquide, une membrane poreuse (2) convenant à la pénétration de composants cellulaires et comportant au moins une zone indicatrice qui peut interagir avec l'analyte lié aux cellules, cette zone indicatrice contenant au moins un élément de liaison dirigé contre l'analyte lié aux cellules, ainsi qu'au moins une zone d'absorption (3) sur la membrane qui absorbe le liquide après traversée des zones indicatrices. La zone indicatrice se situe entre la zone d'alimentation (5) et la zone d'absorption (3). Le procédé selon l'invention permet l'enrichissement et la quantification de la population cellulaire mineure dans des populations cellulaires hétérogènes comme en cas d'hémorragie foeto-maternelle ou de chimères, la détection d'un analyte présent en faible concentration dans des cellules, la détermination de la valeur de l'hématocrite et/ou la détermination parallèle d'analytes liés aux cellules dans des phénomènes de double population.

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